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Level 3-4 Shapes - Symmetry
Does a Jumbo jet have a plane of symmetry?

Level 3-4 Shapes - Symmetry

Spot lines of symmetry and rotational symmetry in KS3 shapes. Fold, flip, and turn figures to check matches, then use symmetry in patterns and problem solving.

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Fascinating Fact:

The Taj Mahal in India is famous for its perfect reflection symmetry along its central axis.

In KS3 Maths, symmetry means matching parts of a shape by reflection or rotation. You will find lines of symmetry, work out rotational order, and use symmetry to solve geometry problems and spot patterns.

  • Line of symmetry: A line that splits a shape into two matching mirror halves.
  • Rotational symmetry: A shape fits onto itself after a turn of less than a full circle.
  • Order of rotation: The number of times a shape maps onto itself in one full turn.
What is a line of symmetry in KS3 maths?

A line of symmetry divides a shape into two mirror halves. If you fold along the line, the halves match exactly with no gaps or overlaps.

What does rotational symmetry and order mean?

A shape has rotational symmetry if it matches itself when turned. The order is how many times it matches in a full 360° turn (order 4 means four matches).

How can I test if a shape has symmetry?

For reflection, fold or use a mirror line to check matching halves. For rotation, turn the shape about its centre and see if it fits before a full turn.

1 .
Which statement describes the symmetry of a parallelogram?
0 lines of symmetry. Rotational symmetry of order 2
1 line of symmetry. Rotational symmetry of order 2
3 lines of symmetry. Rotational symmetry of order 1
1 line of symmetry. Rotational symmetry of order 3
Though you can't 'cut' a parallelogram into two reflective parts, you can rotate it to 'fit' in two positions
2 .
How many lines of symmetry does a square have?
1
2
4
None
One horizontal, one vertical and two diagonal lines
3 .
Does a Jumbo jet have a plane of symmetry?
Yes
No
It has two
It is a plane anyway
Think of two halves, separated by a vertical line running down the centre of the plane from nose to tail
4 .
What is the order of rotational symmetry of a kite?
1
2
3
4
Kites will only cover the same place in one position. If you rotate them less than 360o they will no longer fit the gap
5 .
Which capital letter has the most lines of symmetry?
H
M
S
T
H has two, M and T have one, S has none
6 .
How many lines of symmetry does an isosceles triangle have?
0
1
2
3
As two of its sides are of equal length then isosceles tringles have one line of symmetry
7 .
An equilateral triangle has how many lines of symmetry?
1
3
6
9
One from each of its three angles
8 .
Which of these numbers has a line of symmetry?
2
4
6
8
In fact it has two. You can draw a line vertically and another horizontally to see them more clearly
9 .
What is the order of rotational symmetry of a rectangle?
0
1
2
3
A rectangle can be rotated about its centre into two positions and look exactly like the original rectangle. This is rotational symmetry
10 .
How many planes of symmetry does a cube have?
0
3
6
9
Three of the planes run parallel to the faces of the cube, and the other six run diagonally from one edge to its opposite
You can find more about this topic by visiting BBC Bitesize - Symmetry

Author:  Frank Evans (Specialist 11 Plus Teacher and Tutor)

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